JP2575472Y2 - Seat valve type 3 port valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat valve type three-port valve.

[0002]

2. Description of the Related Art As a seat valve type three-port valve such as a three-way valve or a balance type (pilot type) relief valve, a valve chamber 102 is formed in a valve case 101 as shown in a sectional view of FIG. A valve stem 103 passing through a valve chamber 102 is supported by a valve case 101 so as to be able to advance and retreat in the axial direction thereof.
Is enlarged in the valve chamber 102, and one side is
A pair of valve surfaces (seal surfaces) 105 and 106 are formed, and a pair of valve seats 107 and 108 are opposed to each other at both ends in the valve chamber 102 corresponding to the pair of valve surfaces 105 and 106. There is one formed.

[0003] The valve chamber 102 of the prior art is provided with respective valve seats 107 and 10.
8 communicates with the outside of the valve case 101 by two ports 109 and 110 opening to the inside and another port 111 opening to the peripheral surface of the valve chamber 102. This conventional seat valve type 3
In the port valve, the enlarged diameter portion 104 of the stem 103 is connected to both valve seats 10.
By moving back and forth between 7 and 108, for example, one port 105 is brought into contact with one valve seat 107 to close the port 109, and the other valve face 106 is moved away from the other valve seat 108. Connect port 111 to port 110, and vice versa
The other valve surface 106 is brought into contact with the other valve
And close one valve face 105 to the other valve seat 107.
From the port 111 to communicate with the port 109.

The method of driving the valve rod 102 forward and backward is not particularly limited. For example, as shown in FIG. 4, the valve rod 102 is directly driven forward and backward by a solenoid 112 (direct drive type), or by a driving means such as a solenoid. Alternatively, the pilot valve is automatically opened and closed, the pilot pressure acting on the valve stem 102 or a piston connected to one end of the stem is turned on / off against the return spring, and the valve stem 102 is driven forward and backward (pilot type). Or balance type).

As shown in the half sectional view of FIG.
In order to ensure that the respective valve seats 107 and 108 are sealed when the valve is closed, the rubber members 113 are formed by baking and molding rubber members 113 on the enlarged diameter portion 104 of the metal valve rod 103 and near both sides thereof. I have. Before baking the rubber member 113, dies 114 and 115 are mounted around the valve stem 103 as shown in FIG.

Since the dies 114 and 115 need to be provided over a part of the valve stem 103, that is, over the entire circumference of the enlarged diameter portion 104 and the vicinity of both sides thereof, the molds 114 and 115 must be divided in the circumferential direction with the valve stem 103 interposed therebetween. Must. Therefore, the mold 114,
A burr that radially crosses the valve faces 105 and 106 at a position corresponding to the dividing line 115 is generated. The burrs prevent the valve faces 105, 106 from coming into close contact with the valve seats 107, 108, and are thus removed, for example, by polishing.

[0007]

In this conventional example, in addition to a step of baking and molding a rubber member 113 on a metal valve stem 102, a preparation step for assembling dies 114 and 115, a deburring step, and the like. And a post-processing step are required, the number of steps as a whole increases, and the cost increases. Further, when deburring is performed by polishing, the valve surfaces 105 and 106 may be damaged, and the sealing ability may be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a seat valve type three-port valve that requires a small number of steps and achieves high sealing performance. is there.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a valve case supports a valve stem passing through a valve chamber formed inside the valve case so as to be able to advance and retreat in the axial direction thereof, and expands the diameter of the valve stem in the valve chamber. A seat valve type 3 in which a pair of valve surfaces are formed on both sides of the enlarged diameter portion in the reciprocating direction, and a pair of valve seats are formed in the valve chamber corresponding to each valve surface.
In the port valve, the following measures are taken to achieve the above object.

That is, an annular groove is formed on both sides of the enlarged diameter portion in the axial direction of the valve stem to hold the outer peripheral portion of the annular seal member, and the shaft is formed at a position other than the sealing surface of the corresponding seal member. A rubber annular sealing member formed separately from the valve stem using a mold divided in the center direction is inserted from the end of the valve stem, fitted into the annular groove and held, and the annular sealing member is The valve surface is formed on the outer surface of the groove.

[0011]

The rubber annular seal member of the present invention is formed by using a mold divided in the axial direction of the annular seal, so that a seal without burrs is formed on the end surface of the annular seal member constituting the valve surface. can do.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat valve type 3 according to an embodiment of the present invention will be described below.
The port valve will be specifically described with reference to the drawings. This seat valve type three-port valve is one in which the present invention is applied to a direct acting three-way valve, and as shown in the sectional view of FIG. 1, a valve case 1 penetrates a valve chamber 2 formed therein. The valve stem 3 is supported so as to be able to advance and retreat in the axial direction thereof, and the diameter of the valve stem 3 is increased in the valve chamber 2 so that a pair of valve surfaces 5
6 are formed.

A pair of valve seats 7, 8 are formed in the valve chambers 5, 6 corresponding to the respective valve surfaces 5, 6, and open to the valve chamber 2 inside the valve seats 7, 8. The valve chamber 2 is communicated with the outside of the valve case 1 by one port 9, 10 and one port 11 opened on the peripheral surface of the valve chamber 2. As shown in the half sectional view of FIG. 2, annular grooves 12 and 13 which are recessed in the axial direction of the valve stem 3 are formed on both surfaces of the enlarged diameter portion 4 of the valve stem 3 in the axial direction. Rubber annular seal members 14 and 15 inserted from the respective ends of the valve stem 3 into the annular grooves 12 and 13 are held. The valve surfaces 5 and 6 are formed by the outer end surfaces of the annular seal members 14 and 15.

The sectional shape of the annular grooves 12 and 13 is not particularly limited, and may be U-shaped, V-shaped, trapezoidal, or the like. For simplicity, it has a square cross section. The inner diameter d1 of each of the annular grooves 12 and 13 is not particularly limited. However, in order to securely hold the annular seal member 14, the inner diameter d1 is larger than the general outer diameter d2 of the valve stem 3 in the valve chamber 2. It has a small diameter.

The annular seal members 14 and 15 are, for example, as shown in a sectional view of FIG.
It is formed by pouring rubber into 17 and curing. In the case of the molds 16 and 17, the dividing lines of the molds 16 and 17 are located on the inner and outer peripheral edges of the surfaces (back surfaces) of the annular seal members 14 and 15 corresponding to the groove bottoms of the annular grooves 12 and 13. Even if burrs are formed at the parting line, the annular seal members 14 and 15 may be fitted into the annular grooves 12 and 13 without deburring.

The production of the annular seal members 14 and 15 is based on the valve stem 3
Can be performed in parallel with the above-described processing, whereby the manufacturing time can be reduced and the manufacturing cost can be reduced. When the annular sealing members 14 and 15 are fitted into the annular grooves 12 and 13, the outer diameters d3 of the sealing portions 18 and 19 which are fitted in the valve case 1 in an oil-tight manner are provided at both ends of the valve stem 3. 3 is formed to have a diameter larger than the general outer diameter d2 in the valve chamber 2, so that the sleeve is fitted to the seal portions 18 and 19 as shown by phantom lines in FIG.
A jig 22 including a tapered portion 21 continuous with the sleeve 20 is used.

That is, the sleeve 20 is fitted over the seal portions 18 and 19, and the annular seal members 14 and 15 are pushed into the tapered portion 21 to gradually increase the diameter. It goes over the seal portions 18 and 19 and fits on the valve stem 3. The annular sealing members 14 and 15 which are fitted over the valve stem 3 beyond the sleeve 20 are further pushed in until they are completely fitted into the annular grooves 12 and 13.

As shown in FIG. 1, one end of the valve stem 3 projects out of the valve case 1 and is driven by a solenoid 23 attached to the valve case 1. Further, a return spring 24 facing the solenoid 23 is attached to the other end of the valve stem 3. As described above, the annular sealing member
Since the burrs 14 and 15 are generated on the inner and outer peripheral edges of the surfaces (rear surface) of the annular seal members 14 and 15 corresponding to the groove bottoms of the annular grooves 12 and 13, the burrs are formed from the outer end surfaces of the annular seal members 14 and 15. The valve faces 5, 6 have no burrs at all, and therefore it is not necessary to polish the valve faces 5, 6. As a result, the number of steps can be reduced, the manufacturing time can be further reduced, and the manufacturing cost can be further reduced. Further, there is no possibility that the valve surfaces 5 and 6 are damaged during the deburring operation, and high sealing performance can be obtained.

In addition, the annular seal members 14 and 15 are
Are fitted and held in the annular grooves 12, 13 which are recessed in the axial direction of the valve stem 3 on both sides of the valve stem 3, so that the annular sealing members 14, 15 expand radially outward by the outer peripheral portion of the enlarged diameter portion 4. This prevents the valve faces 5 and 6 from being deformed over a long period of time, and prevents the deformation of the valve faces 5 and 6 from impairing the high sealing property over a long period of time.

The present invention is not limited to the above-mentioned embodiment applied to a direct acting three-way valve, but is also applicable to a pilot type (balanced type) or manually operated three-way valve, a pilot type relief valve, and the like. You can apply the idea.

[0021]

As described above, according to the present invention, since the annular seal member is formed separately from the valve stem, the annular seal member is formed in parallel with the processing of the valve stem, thereby reducing the manufacturing time. And the manufacturing cost can be greatly reduced. In addition, since the annular seal member is formed separately from the valve stem using a mold that is divided in the axial direction at a portion other than the seal surface of the corresponding seal member, burrs are formed on the end surface constituting the valve surface. No annular seal member can be formed, and deburring becomes unnecessary. As a result, the deburring step is omitted, the man-hour is reduced, and the manufacturing time can be further shortened.
Manufacturing costs can be further reduced significantly.

Furthermore, by omitting the deburring operation, there is no possibility that the valve surface will be damaged during the deburring operation.
High sealing performance can be obtained. In addition, the annular seal member is recessed in the axial direction of the valve stem on both sides of the enlarged diameter portion and is fitted and held in the annular groove holding the outer peripheral portion of the annular seal member. The portion prevents the annular seal member from expanding outward in the radial direction, makes it difficult for the valve face to be deformed for a long period of time, and can prevent the high sealing property from being impaired by the deformation of the valve surface for a long time.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a half sectional view of a main part of one embodiment of the present invention.

FIG. 3 is a sectional view of a mold of the annular sealing member according to the embodiment of the present invention;

FIG. 4 is a sectional view of a conventional example.

FIG. 5 is a half sectional view of a main part of a conventional example.

FIG. 6 is a front view of a conventional mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve case 2 ... Valve chamber 3 ... Valve rod 4 ... Expanded part 5, 6 ... Valve face 7, 8 ... Valve seat 12, 13 ... Annular groove 14, 15 ... Annular sealing member 16, 17 ... Die

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve case which supports a valve stem which penetrates a valve chamber formed inside thereof so as to be able to advance and retreat in an axial direction thereof,
A seat valve type in which a valve stem is enlarged in a valve chamber, a pair of valve surfaces are formed on both sides of the enlarged diameter portion in the reciprocating direction, and a pair of valve seats are formed in the valve chamber corresponding to each valve surface. In the three-port valve, an annular groove is formed on both sides of the enlarged diameter portion in the axial direction of the valve rod to hold an outer peripheral portion of the annular seal member. A rubber annular sealing member formed separately from the valve stem is inserted from the end of the valve stem using a mold divided in the center direction, fitted into the annular groove and held, and the annular sealing member is A seat valve type three-port valve, wherein the valve surface is formed on an outer surface of a groove of the valve.